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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHM AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration (ug/L) Well Elevation to Water Elevation Thickness Ethyl_ - Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE M W 1 05/08/97 643 1690 -1037 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MWI 08/26/97 643 18 58 -12 15 000 MWI 11/11/97 643 19 15 -1272 000 MWI 03/03/98 643 1330 -687 000 -- M W 1 05/20/98 643 1348 -7 05 000MWI 08/19/98 643 1492 -849 000 -- -- MWI MW1 11/18/98 643 1534 -891 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MWI 03/30/99 643 -- MWI -MW1 05/05/99 643 13 88 -745 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 M W 1 08/20/99 643 1526 -8 83 000 MWI 12/06/99 643 1542 -899 000 -- M W I 02/29/00 643 -- MWI -MW1 05/16/00 643 13 19 -676 000 -- -- MWI 09/11/00 643 1544 -901 000 <0 5 <0 5 <0 5 071 <50 <0 5 MWI 12/13/00 643 15 38 -8 95 000 <0 5 <0 5 <0 5 0 71 <50 <0 5 M W 1 03/08/01 643 -- MWI -MW1 06/21/01 643 1586 -943 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MWI 09/20/01 643 1693 -1050 000 MWI 12/04/01 638 1671 -1033 000 -- -- MWI 03/05/02 638 1600 -962 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MWI 06/11/02 638 1649 -1011 000 -- -- MWI 09/10/02 638 1750 -11 12 000 MWI 12/18/02 638 1726 -1088 000 -- -- MWI 03/24/03 638 1695 -1057 000 <0 5 <0 5 <0 5 <0 5 <50 h <50 MW2 01/87 877 -- 26 190 -- 1,100 11,000 MW2 07/16/87 877 1880 -1003 000 68 26 630 1,320 4,800 MW2 04/11/88 877 21 89 -13 12 000 94 <20 240 880 11,000 - MW2 09/13/88 877 2432 -15 55 000 600 62 520 1,900 7,400 MW2 11/16/88 877 2447 -1570 000 840 140 650 1,600 10,000 MW2 02/09/89 877 2902 -2025 000 480 55 660 1,700 7,200 -- MW2 05/31/89 8 77 2569 -1692 000 680 62 S00 3,100 17,000 -- g 1pro3ects173942�masterlwp1gO3O3\39426w As Page 4 of 47